6.6 Free Fall Explained (pages 93-95 31. Look at the two books resting on a shelf cle the llustration shown below. letterme the two is true. each statement about the two books that a. Both books have the same mass. b. Both books exert the same force on the shelf. c. Both books exert the same pressure on the shelf. d. Both books have the same weight. 32. An object d in air that experiences no air resistance is said to be in 33. A1-kg river rock and a 10-kg small boulder are dropped from the back of at the same time Identify which rock will strike the ground first. 35. Circle the letter of each statement about freely falling objects that is true. a. They all fall with the same acceleration. b. The net force acting on them is their weight. c. Their weight-to -mass ratios are always the same. d. Their acceleration is g, the acceleration due to gravity. 34 on the object is 6.7 Falling and Air Resistance (pages 95-97) 36. Identify the conditions needed for a feather and coin to fall at the same rate. 37. Circle the letter of each factor that affects the amount of air resistance experienced by an object. a. time in contact with the air c. surface area of object b. speed of object through the air d. weight of object 38. Circle the letter that describes the forces that are in balance when an object reaches its terminal speed. a. mass and air resistance b. air resistance and friction c. friction and mass d. weight and air resistance 39. Define terminal speed and terminal velocity. __

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6.6 Free Fall Explained (pages 93-95 31. Look at the two books resting on a shelf cle the llustration shown below. letterme the two is true. each statement about the two books that a. Both books have the same mass. b. Both books exert the same force on the shelf. c. Both books exert the same pressure on the shelf. d. Both books have the same weight. 32. An object d in air that experiences no air resistance is said to be in 33. A1-kg river rock and a 10-kg small boulder are dropped from the back of at the same time Identify which rock will strike the ground first. 35. Circle the letter of each statement about freely falling objects that is true. a. They all fall with the same acceleration. b. The net force acting on them is their weight. c. Their weight-to -mass ratios are always the same. d. Their acceleration is g, the acceleration due to gravity. 34 on the object is 6.7 Falling and Air Resistance (pages 95-97) 36. Identify the conditions needed for a feather and coin to fall at the same rate. 37. Circle the letter of each factor that affects the amount of air resistance experienced by an object. a. time in contact with the air c. surface area of object b. speed of object through the air d. weight of object 38. Circle the letter that describes the forces that are in balance when an object reaches its terminal speed. a. mass and air resistance b. air resistance and friction c. friction and mass d. weight and air resistance 39. Define terminal speed and terminal velocity. __

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Let's address each question step by step:**Question about the two books:**Since the two books are identical, we can make the following conclusions:a. Both books have the same mass.True. If the books are identical, they have the same mass.b. Both books exert the same force on the shelf.True. The force exerted by each book on the shelf is equal to its weight, which is the product of its mass and the acceleration due to gravity (F = m * g). Since both books have the same mass and are under the influence of the same gravitational acceleration, they exert the same force on the shelf.c. Both books exert the same pressure on the shelf.False. Pressure is defined as force per unit area (P = F/A). If one book is on top of the other, the bottom book supports the weight of both books, while the top book only supports its own weight. Therefore, the bottom book exerts more force over the same area, resulting in greater pressure on the shelf.d. Both books have the same weight.True. Weight is the force of gravity acting on an object (W = m * g). Since both books have the same mass and are under the influence of the same gravitational acceleration, they have the same weight.**Answers for the questions from the textbook:**32. An object dropped in air that experiences no air resistance is said to be in **free fall**.33. A

river rock and a

small boulder are dropped from the back of a truck at the same time. Identify which rock will strike the ground first.Answer: **Neither**. In the absence of air resistance, both rocks will strike the ground at the same time due to the constant acceleration of gravity.34. When an object is in free fall, the only force acting on the object is **gravity**.35. Circle the letter of each statement about freely falling objects that is true.a. They all fall with the same acceleration.True. All objects in free fall near the Earth's surface accelerate at

, regardless of their mass.b. The net force acting on them is their weight.True. In free fall, the only force acting is gravity, which is equivalent to the object's weight.c. Their weight-to-mass ratios are always the same.True. The weight-to-mass ratio is the acceleration due to gravity

, which is constant for all objects near the Earth's surface.d. Their acceleration is

, the acceleration due to gravity.True. This is the definition of free fall.36. Identify the conditions needed for a feather and coin to fall at the same rate.Answer: The conditions needed are a vacuum or an environment without air resistance.37. Circle the letter of each factor that affects the amount of air resistance experienced by an object.a. time in contact with the airFalse. Time does not directly affect air resistance; it's the duration of the exposure to air resistance that can affect the velocity of the object.b. speed of object through the airTrue. Air resistance increases with the speed of the object.c. surface area of objectTrue. Larger surface areas experience greater air resistance.d. weight of objectFalse. Weight does not directly affect air resistance; however, heavier objects tend to fall faster in air because they have a higher terminal velocity.38. Circle the letter that describes the forces that are in balance when an object reaches its terminal speed.a. mass and air resistanceFalse. Mass is not a force.b. air resistance and frictionFalse. Friction is not the force we consider when talking about objects falling through the air.c. friction and massFalse. Same as above, and mass is not a force.d. weight and air resistanceTrue. Terminal speed is reached when the weight of the object is balanced by the air resistance.39. Define terminal speed and terminal velocity.Answer: Terminal speed is the constant speed that an object reaches when the force of air resistance is equal in magnitude and opposite in direction to the force of gravity. Terminal velocity is the terminal speed together with the direction of motion.

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